diff --git a/src/librustdoc/html/static/themes/ayu.css b/src/librustdoc/html/static/themes/ayu.css
index 6e8db1e9eb792..5f6ba5b875f7f 100644
--- a/src/librustdoc/html/static/themes/ayu.css
+++ b/src/librustdoc/html/static/themes/ayu.css
@@ -513,7 +513,7 @@ kbd {
 }
 
 #theme-choices > button:not(:first-child) {
-	border-top-color: #c5c5c5;
+	border-top-color: #5c6773;
 }
 
 #theme-choices > button:hover, #theme-choices > button:focus {